Protect move tool from re-entrancy.

m_dragInProgress is usually sufficient, except when we haven't started
one yet.  In any case, conflating the two is probably a bad idea.

Fixes https://gitlab.com/kicad/code/kicad/issues/12936

common/tool/selection_tool.cpp

@@ -217,6 +217,10 @@ void SELECTION_TOOL::onDisambiguationExpire( wxTimerEvent& aEvent )
     if( selection().GetSize() >= 2 )
         return;
 
+    // If another tool has since started running then we don't want to interrupt
+    if( !getEditFrame<EDA_DRAW_FRAME>()->ToolStackIsEmpty() )
+        return;
+
     m_toolMgr->ProcessEvent( EVENTS::DisambiguatePoint );
 }